I have an ls/vtec with the following:
PCT pistons, 01' ITR cams, b16a head, ls block renforced bottom end (stock deck height, and stock head height), 2 layer head gasket, B&M command flo, Vtec controller, "comptech" ice box, DC 4-1, Apex'i World sport...ect thats all that i have done thats concerned with power... Now to my question. i have a problem with my car leaning out at 6.5K, I have an auto meter air/fuel gauge (yeah i know its NOT wideband, but it gives me an idea).

any ideas why it runs pretty good ratios at WOT until 6.5k and then leans out?

thanks in advance...
-sander


Modified by jazzyfoo at 5:09 PM 9/5/2003

 

Maybe your fuel pump is going bad, maybe you need bigger injectors, maybe you just need to clean your injectors.

 

you think so? thats sort of on the line of what i was thinking, is there anyway to tell whether its the pump or the injectors?

ps im on the stock 240'cc inj. with stock integra fuel pump

-sander

EDIT: this is jazzyfoo, im on b16a ferio's computer

 

Honestly, I don't know much about B series. I stick to H22s. Hopefully someone else can tell you if you have the right fuel system for your setup.

Try some injector cleaner or find a friend with some good injectors and see if that fixes it. Also you can check your fuel pressure and see if it is low. If your pump is dying your fuel pressure should be lower than spec.

 

EDIT: this is jazzyfoo again...

thanks laughinxxx for your prompt responses

anyone have any insight?

-sander

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by laughinxxx &raquo;</TD></TR><TR><TD CLASS="quote">Try some injector cleaner or find a friend with some good injectors and see if that fixes it. Also you can check your fuel pressure and see if it is low. If your pump is dying your fuel pressure should be lower than spec. </TD></TR></TABLE>

i just cleaned the injectors at my shop with our carbon clean machine, and my fuel pressure is around 50 psi, with command flo
mabye it is the injectors...

-sander

 

Actually the AutoMeter is NOT wideband, it's narrowband and it's garbage. If you are going by that forget it. Strap it to the dyno and find out your REAL readings. If you have an FPR and VAFC then just set a good base pressure and richen/lean accordingly. It's called tuning and everyone can benefit from it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jazzyfoo &raquo;</TD></TR><TR><TD CLASS="quote">, I have an auto meter air/fuel gauge (yeah i know its NOT wideband, but it gives me an idea).</TD></TR></TABLE>

no need to be harsh, its a typo. relax. i know autometers are not wide band, thats why they are 60 bucks and not 1200 like some of the motec systems ive seen. i know i need to go to a dyno, this is not about perfecting my ratios, its about why i lean out at 6.5k not about gaining the most power possible. Ive also played with the wide open settings on the vafc and pumped the correction way up past 7k, and made no diffrence, i think ill go with some new injectors, any feelings on size? 270? 310?

-sander

 

did you mean 50 psi with the vaccum line off? if that is with it on, that is way too high. plus with itr cams and your setup, your stock injectors are spraying at the correct duty cycle more so. with the vaccuum on keep your fuel pressure at about 40-42. maybe its your fuel pump??

 

yeah 50psi is at WOT (@ atmospheric press.)
yeah mabye it is the fuel pump, mabye ill get both fuel pump and injectors, but im broke as a joke right now. ugg.

-sander

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jazzyfoo &raquo;</TD></TR><TR><TD CLASS="quote">

no need to be harsh, its a typo. relax. i know autometers are not wide band, thats why they are 60 bucks and not 1200 like some of the motec systems ive seen. i know i need to go to a dyno, this is not about perfecting my ratios, its about why i lean out at 6.5k not about gaining the most power possible. Ive also played with the wide open settings on the vafc and pumped the correction way up past 7k, and made no diffrence, i think ill go with some new injectors, any feelings on size? 270? 310?

-sander</TD></TR></TABLE>

No harshmess. Just letting you know. So you think dyno tuning is only about making the most power possible? Well that's a problem right there. Tunning to an A/F curve of say 13.7:1 probably isn't going to give you the most power, but damn if it won't run smooth, and get great gas milage and make good power. If you want to tune for all out peak power for numbers that's one thing, but tuning your car to run well is another. Either way I personally do not trust those gauges and think they are a waste. You may strap it on the dyno and find out your are actaully running rich before 6,500 and stoich after that or something else. Oh well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">

No harshmess. Just letting you know. So you think dyno tuning is only about making the most power possible? Well that's a problem right there. Tunning to an A/F curve of say 13.7:1 probably isn't going to give you the most power, but damn if it won't run smooth, and get great gas milage and make good power. If you want to tune for all out peak power for numbers that's one thing, but tuning your car to run well is another. Either way I personally do not trust those gauges and think they are a waste. You may strap it on the dyno and find out your are actaully running rich before 6,500 and stoich after that or something else. Oh well.</TD></TR></TABLE>

Yeah, sorry its hard to tell on this site, i just get real defensive sometimes on HT. I completely agree with you that the autometer stuff is junk, any air fuel system device under 400 bucks is probably junk. im loooking around for some very precise wide band O2 system that manipulates readings off of a VX/CX o2 sensor, just something one of my very trust worthy friends told me, anybody know anything about it?. anyway going to a dyno to really figure this out is probably the way to go...thanks for your input guys.

-sander